Bottom-quark Forward-Backward Asymmetry, Dark Matter and the LHC

Abstract

The LEP experiment at CERN provided accurate measurements of the $Z$ neutral gauge boson properties. Although all measurements agree well with the SM predictions, the forward backward asymmetry of the bottom-quark remains almost 3$\sigma$ away from the SM value. We proposed that this anomaly may be explained by the existence of a new $U(1{)}_D$ gauge boson, which couples with opposite charges to the right-handed components of the bottom and charm quarks. Cancellation of gauge anomalies demands the presence of a vector-like singlet charged lepton as well as a neutral Dirac (or Majorana) particle that provides a Dark Matter candidate. Constraints from precision measurements imply that the mass of the new gauge boson should be around $115$~GeV. We discuss the experimental constraints on this scenario, including the existence of a di-jet resonance excess at an invariant mass similar to the mass of this new gauge boson, observed in boosted topologies at the CMS experiment.

45 pages, 6 figures. v2: references added, minor changes, version matched to journal

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Cited by in corpus (8)

• A Light Higgs at the LHC and the B-Anomalies
• Search for low-mass resonances decaying into bottom quark-antiquark pairs in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• The anomalous $Zb\bar{b}$ couplings at the HERA and EIC
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• The $Zb\bar{b}$ vertex in a left-right model
• Tracing the bottom electroweak dipole operators at future lepton colliders